Smart PT

Smart SDI-12 / RS-485 Pressure, Temperature, and Digital Crest Gauge Sensor

smart PT pressure and temperature sensor

Stevens’ Smart PT is a ceramic membrane pressure and temperature sensor that delivers accurate results for a wide range of fluid level measurement applications. In addition to simple instantaneous measurements, this smart sensor features the ability to capture peak crest levels, and to automatically sample and report basic statistics on a configurable time interval.

A corrosion-resistant stainless steel housing and potted electronics make Smart PT extremely durable and long lasting for submersible water applications.

Smart PT is available with a vented or absolute pressure sensing module. Both versions come equipped with user specified length of cable. The vent tube provides an atmospheric reference which compensates for variations in barometric pressure.

In addition to programmable corrections for local variations in Earth’s gravitational field, Smart PT also compensates automatically for the water temperature-density dependency.

Every Smart PT provides both SDI-12 and RS-485 digital interfaces. Compatible with existing power and data logging instruments, the sensor can easily be deployed for data collection at remote monitoring sites.

Features

  • < ± 0.1% full scale accuracy
  • Aluminum oxide ceramic membrane
  • Digital output (SDI-12 / RS485)
  • Depth scales available from 2 meters (6.6 feet) up to 200 meters (660 feet)
  • Rugged housing and fully potted electronics - no risk of leaking
  • Compact size
  • Not damaged by freezing water
  • Vented or non-vented cable, user specified length
  • Direct pipe connection option
  • Low power consumption
  • Lightning protection
  • Overpressure tolerant

Unique Abilities

  • Average and standard deviation outputs on up to 3600 autosampled data points over configurable time window
  • Crest gauge function automatically captures minimum and maximum level
  • Smart autosampling can provide smoothing and oversampling
  • Custom offsets
  • Environmental corrections for local gravitational field and changes in fluid density due to temperature

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What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications

Supply voltage

6 - 28 VDC (12 VDC typical)

Current consumption

Average, SDI-12, one measurement per minute: 60 μA
Average, RS-485, one measurement per minute: 600 μA
Peak current, during response to host: 30 mA

Output

SDI-12 (Version 1.4) and RS-485
Selectable output: Pressure in bar, kPa, psi or water depth in m, cm, ft.
Temperature in °C or °F

Operating temperature

-20 °C to 80 °C (-4 °F to 176 °F)

Storage temperature

-40 °C to 80 °C (-40 °F to 176 °F)

Pressure accuracy

± 0.1% of full scale

Temperature accuracy

± 0.25 °C (0.45 °F)

Wiring

Red: 6 - 28 Vdc, Black: GROUND, Blue: SDI-12, White: RS-485 A/+, Green: RS-485 B/-

Cable

High durability polyurethane (26 AWG)

Pipe threading

M14-1

Dimensions

86.4 mm x 22.1 mm (3.4 in x 0.9 in)

Body material

316L Stainless Steel

Weight

Probe: 120 g (4.23 oz.)
Cable: 40 g per m (0.43 oz. per ft)